Washington, Oct 28: While the Federal Government continues to restrict research on stem cells taken from embryos, states are trying to create legal loopholes for scientists to continue what could be life-saving experiments, actor and activist Christopher Reeve said. So far, only California has passed a law that allows the use of state funds for research into harvesting and using stem cells from any source, including embryos. But other states are moving in that direction, Reeve said. ''A half-dozen or more key states will lead the way,'' Reeve said in an interview after a briefing commemorating the fifth anniversary of the first isolation of human stem cell lines from embryos.